remove thankyou announcement page doc

Author: brianshen1990

packages/ui-extensions/docs/surfaces/checkout/reference/helper.docs.ts

@@ -152,7 +152,6 @@ export function getExamples(
     ...createExample('purchase.thank-you.footer.render-after/default'),
     ...createExample('purchase.checkout.chat.render/default'),
     ...createExample('purchase.thank-you.chat.render/default'),
-    ...createExample('purchase.thank-you.announcement.render/default'),
     'analytics-publish': {
       description:
         'You can publish analytics events to the Shopify analytics frameworks and they will be propagated to all web pixels on the page.',